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RHEUEL H. FREDERICK, OF IRVINGTON., NEN JERSEY, ASSGNOR OF TWO-FEFTHS TOCHARLES F. AMES, OF BROOKLYN, NEW' YORK, AND ONE-FIFTH TO ALPHONSE H. E.

BERCHEM, OF NEVI YORK, N. Y.

CENTRIFUGAL PUMP.

Application filed .Tunel 2,

rlhis invention relates to that class of rotary impeller pumps whereinthe kinetic energy of a current of water is utilized to exhaust a spaceor chamber containing fluids, either liquid or gaseous, lor both. or todeliver gases into a compression chamber or other container.

The invention more especially concerns the type of vacuum pumps whereinthe luid to be ejected is entraincd with the motive liquid anddischarged therewith, as, for example, in vacuum producing apparatus forsteam heating plants. v

rllhe principal object of my invention is to provide a pump of simpleand eiicient construction whereby the maximum energy generated by thecentrifugal force-ot' the liquid in its passage through the rotaryimpeller is utilized to effect and maintain high degree ot vacuum in aspace or chamber to be exhausted. s

l/Vith this and other objects in view, the invention comprises novelfeatures of construction and combinations or parts which will behereinafter described and claimed.

In the drawingsn Figure 1 is a side elevation, partly in section, of apump embodying the preferred form 'of my invention.

I Fig. 2 is an velevation of the pump, partly in section, as on the line2-2 of Fig. 1.

Fig. 3 is a transverse vertical section, as on the line 3 3 of Fig. 1.

Fig. 4 is a sectional detail, enlarged, of vthe Venturi nozzle of thevacuum impeller and the adjacent diffuser chamber'.

Referring to the drawings, 10, 11 designate complemental lower and uppersections constituting a pump housing or casing within which are formedin spaced-relation to each other two chambers 12, 13 in which impellers14, 15, respectively, are mounted to rotate. In the present instance theimpeller 141 constitutes a pressure impeller and the other a vacuumimpeller, said impellers being tast on a power driven shaft- 16 which isj ournaled in suitably disposed bearings on the casing.

The chamber 12 is oitl volute loi-m with a suitably located outlet 17,and the impeller 14 which is mounted in this chamber coniprises twospaced apart walls 18 with interposed vanos 19 of proper number andcurva- 1928. Serial N0. 113,309.

ture to meet the particular requirements of service. One ot the walls isprovided with a central eye 20 in communication with an inlet port 21formed in the casing. The liquid flows from thisi port to the interiorot the rapidly rotating impeller by way of the eye 2O and is dischargedthrough the outlet 17 of the chamber 12. The function of the impeller14, when the pump is used in connection with a steam heating system, isto deliver the surplus water of condensation from a suitable receivingchamber to a boiler or 'other point of discharge. as illustrated in myeo-pending application Serial No. 113.308, filed simultaneouslyherewith.

The chamber 13 is of circular form, and the vacuum impeller 15 which ismounted to rotate therein, is formed similarly to the pressure impeller-from the center to the outer extremities of the vanes 22, but, in thevacuum impeller the side walls 23 are extended routwardly beyond thevanes and the peripheral extensions are provided with oppositely curvedinternal surfaces to presenta circumferential Venturi nozzle 24. The eye25 of the impeller 15 communicates with an inlet port 26 formed in thecasing. The liquid passes from this port to the rotating impellerthrough the eye 25 and is ejected through the Venturi nozzle in the formof a diverging annulus, as will hereinafter appear.

Spaced from and surrounding the circumerenti al Venturi nozzle is anannular chamber 27 having fixed therein a series of suitably curvedvanes 28 which are arranged at intervals apart so as to intercept anddiffuse the liquid discharged from the impeller nozzle, as well astluids-liquid or gaseous which may be entrained in the dischargedliquid. rlhesc vanos are preferably supported in and between two annularplates 29 unich are seated in recesses in the walls ot the chamber 27,and which plates are 'formed to extend liieyond the vanes at thereceiving portion ot theI chamber. These plates 29, which constitute ineffect side walls for the chamber 27, are flared or outwardly inclined,as at 30, in opposite relation to the adjacent outer flaring portieri lof the Venturi nozzle. The chamber 27, which constitutes a whirlpool ordiffuser chamber, is surrounded by a volute or spiral vse '.uum chamber34.

chamber 32 having a discharge outlet 33 at the upper portion ot thecasing.

Formed in the lower portion ot the casing and within the path ol"rotation oit the impeller venturi 214, is a vacuum chamber 34 includingports 35 which are adapted to be connected with the apparatus or systemto be exhausted, as, tor example, the return line of a steam heatinglsystem.

From the foregoing it will be seen that during the rotation ot thevacuum impeller 15 the liquid flowing thereto trom the port 26, isejected at high velocit),Y through the venturi in the torni ot adiverging annuhis, which, impinging` against the opposing tapering wallsof the chamber 2", at or adjacent the inner edges ot the vanes 2Sestablishes a water seal etl'ective to prevent any air or liquid fromflowing baciinto the vac- This liquid annui by its tapering sides,toi-ms a V-shape gap which has the action et' an ejector, in that theenergy ot the fluid in iteA passage to the chamber 27 is etl'ective tocreate und maiutain in the chamber El a partial vacuum sufficient toexhaust the system or apparatus to which the ports 35 are connected. Thegases or other fluids thusexpelled troni the system pass into thediffuser chamber '2T and are therein coinmingled or mixed with theliquid contents ot the latter and the Whole finally discharged throughthe outlet of the volute chamber.

By virtue of the characteristic form ofthe Venturi nozzle` the entirepressure energy et the fluid generated by the centrifugal torce impartedthereto by the ral'iitlly rotating impeller l5 is changed into velocityor ltinetic energy in the portion ot the nozzleV from the outerextremities ofthe venes Q2 to the contracted area ot the nozzle, and asthe liquid escapes from this contracted area a portion of the velocityenergy is changed back to the form ot pressure energy. Hence bothpressure energy and velocity ener V the liquid are present at the circumence of the impeller l5, the velocit);r energy compensating for anylosses that may occur When the liquid is flowing trom the circui'inference of the impeller, thus insuring pump efficiency.

`Formed in the upper part ot the pump easing are two ports 3S incommunication at their lower ends with the supply ports for the centralinlets ot' the respective impellers, which ports 3G lead to a suitablepoint of discharge, and ali'ord vents for the diversion and escape otentrained g which would otherwise pass with the liq into the impellers.

The vacuum impeller illustrated herein in conjunction witl the pressureiinpeller 14s since the assf'iciated pellers may be advantageouslyemployer .in a vacuum producing apparatus tor steam heating syspiltemsas described in my co-pending application atoresaid. The describedvacuum impcller niay be used tor the purpose ot ejecting fluids, eitherliquid or gaseous, under various conditions, and also to perform theitunction olf gas compresaor- My invention is not limited to theparticular construction and arrangement ot' parts herein disclosed toexemplify the invention, as the structure may be modied in many respects'iithin the principle of the invention and the scope ot the appendedclaims.

l. A pump comprising a casing, an impeller chamber therein, acentrifugal impeller n'iounted to rotate in said chamber and having acentral fluid inlet and a C11'- ciunterential Venturi nozzle, a chamberspaced from and encircling said nozzle and adapted to receive adiverging annulus of 3 'lluid ejected from the nozzle, a vacuum chamberin operative communication with the venturi and the encircling chamber,and a discharge chamber encircling the latter chamber.

Q. A pump comprising acasing, an impeller chamber therein, Va.centrifugal impcller mounted to rotate in said chamber and having a cent'al fluid inlet and a circumferential Venturi nozzle, a chamber spaced:trom and encircling said nozzle and hav' ing flaring side Wallsarranged in opposite relation to the outwardly flaring walls of theventuri and adapted to receive a divergiug annulus of fluid ejected fromthe nozzle, a vacuum chamber in operative communication with the venturiand the encircling chamber, and a discharge chamber encircling thelatter chamber.

3. A pump comprising a casing, an impeller chamber therein, acentrifugal i111- peller mounted to rotate in ysaid chamber and having acentral fluid inlet and a circumferential Venturi nozzle, a diffuserchamber spaced from and encircling said nozzle and having spaced apartvanes, the

valls ot said latter chamber extending beyond the vanes toward thenozzle, and being flared in opposite relation to the flaring walls ofthe nozzle and adapted to receive 115 a diver-ging annulus of fluidejected from the nozzle, a vacuum chamber in operative connnunicationwith the venturi and the dittuser chamber, and a discharge Chamberencircling the diffuser chamber.

l. A pump comprising a casing, an impeller chamber therein7 acentrifugal impeller mounted to rotate in said chamber and having acentral luid inlet and a circumferential Venturi nozzle, a diffuserchamber spaced fromand encircling said nozzle and comprising two annularWall plates and spaced apart vanes therebetween, said platesextendingbeyond the vanes toward the nozzle and being adapted to receivea diverging annulus of fluid from the nozzle, a vacuum chamber inoperative communication with the venturi and the diffuser` chamber, anda discharge chamber encircling the diffuser chamber.

5. A pump comprisinga casing, an impeller chamber therein, a centrifugalim peller mounted to rotate in said chamber and having a central fluidinlet and a circumferential outlet, a supply port leading to said inlet,a vent port communicating with said supply port adjacent the inlet, anda discharge chamber in communication with the impeller chamber.

6. A pump comprising a casing, an impeller chamber therein, acentrifugal impeller mounted to rotate in said chamber and having acentral fluid inlet and a circu1nferential Venturi nozzle, a supply portleading to said inlet, a vent port communicating with said supply portadjacent the inlet, a chamber spaced from and encircling said nozzle andadapted to receive a diverc,inf g` annulus of fluid ejected from thenozzle, a vacuum chamber in operative communication with the venturi andthe encircling chamber, and a discharge chamber encircling the latterchamber.

7. A centrifugal vacuum impeller, comprising` two side walls, vanestherebetween, a central inlet in one of said Walls, and acircumferential Venturi nozzle between the walls and outwardly of thevanes.

8. A pump comprising a casing having a chamber therein, a. rotar7impeller having a central fluid inlet leadingl thereto within saidchamber, said impeller having,r a circumferential Venturi nozzle at itsperiphery, vanes within the impeller between the nozzle and the fluidinlet, there being an outlet for vapor and water from said chamber,there being an annular suction space on each side of the nozzle fromwhich air and vapor are drawn by the jet of fluid issuing from thenozzle, an inlet leading to said suction spaces, a fluid chamber incommunication with the central fluid inlet to the impeller, and means torotate the impeller.

Signed at New York in the county and Sta-te of New York this 28th day ofMay A. D. 1926.

RHEUEL H. FREDERICK.

